Winding apparatus for a web

ABSTRACT

An apparatus for winding up a web, particularly a cord fabric with loose wefts, to form a web roll on a winding core. The web with the core supported in bearings, is rotated by a pair of drive rollers, independently driven by a pair of adjustable hydraulic motors, and mounted on a pair of carriers which are pivotally supported by a pair of swing arms moved by hydraulic motors toward the web so that the carriers and drive rollers assume positions in which both drive rollers frictionally engage and wind up the web while the winding core rotates in bearings. The carriers can be turned relative to the swing arms by another motor to drop the finished web roll onto a ramp when the core with the completed web roll is released from the bearings.

United States Patent [191 Krueckels et a1.

[ Dec. 3, 1974 1 WINDING APPARATUS FOR A WEB [73] Assignee:Maschinenfabrik Zell J. Krueckels KG, Zell, Germany [22] Filed: Oct. 16,1972 [21] Appl. No.: 297,989

7/1963 Washburn 242/66 5/1964 Miller 242/66 X Primary Examiner.lohn W.Huckert Assistant Examiner-Edward J. McCarthy Attorney, Agent, orFirm-Michael S. Striker 5 7 ABSTRACT An apparatus for winding up a web,particularly a cord fabric with loose wefts, to form a web roll on awinding core. The web with the core supported in bearings, is rotated bya pair of drive rollers, independently driven by a pair of adjustablehydraulic motors, and mounted on a pair of carriers which are pivotallysupported by a pair of swing arms moved by hydraulic motors toward theweb so that the carriers and drive rollers assume positions in whichboth drive rollers frictionally engage and wind up the web while thewinding core rotates in bearings. The carriers can be turned relative tothe swing arms by another motor to drop the finished web roll onto aramp when the core with the completed web roll is released from thebearings.

16 Claims, 10 Drawing Figures Pf/ A PATENTEL DEC 74 SHEEI 3 OF 6 saw 50F 6 PATENTEL 31974 WINDING APPARATUS FOR A WEB BACKGROUND OF THEINVENTION Winding apparatus is known which comprises a pair of swingarms carrying a drive roller contacting the winding core or the webwound thereon, to drive it by friction. This has the disadvantage thatthe drive roller slips on the web if the friction coefficient of thematerial is low, unless slipping is prevented by a very high 1 contactpressure. However, high contact pressure between the drive roller andthe web roll frequently result in very hard web rolls. Other apparatusfor winding up a web is known, in which a web roll and its winding coreare supported on a pair of drive rollers mounted -in stationary bearingsso that when the web is wound up, the winding co're rises as thediameter of the web roll increases. During this operation, the weight ofthe web roll increases with the diameter, and the hardness of the webroll becomes undesirably great.

Hard web rolls are undesirable, particularly if the web roll consists ofcertain types of fabrics. This is particularly true of cord fabric witha loose weft, as is used in the manufacture of tires. However, thehardness of the web roll should conform to the weight and to certaincharacteristics of the material, since a predetermined winding densityis required.

A disadvantage of known winding apparatus of this type, is that verysmooth material, such as nylon, slips relative to the single driveroller so that the web is not properly wound up.

SUMMARY OF THE INVENTION It is the object of the invention to provide anapparatus for winding up a web, which overcomes the disadvantages ofprior art apparatus serving the same purpose.

Another object of the invention is to provide a windup apparatus inwhich the web is reliably wound up on a core, even if the web consistsof a very smooth synthetic yarn, such as nylon.

A further object of the invention is to obtain a predetermined uniformwinding density of the web roll, which is not influenced in anundesirable manner by additional pressure required for driving the webroll.

With these objects in view, the present invention comprises a pair ofdrive rollers mounted on carrier means turnable with the same about acommon shaft.

It has been found that such an arrangement according to the inventionovercomes the disadvantages of known winding apparatus, that the twodrive rollers contact the winding core or the web with practically thesame pressure, and that reliable driving of the web roll is assuredwithout increasing the hardness of the web roll.

One embodiment of the invention comprises bearing means supporting awinding core for rotation about a.

core axis; a pair of drive rollers for frictionally engaging and windingup a web on the core; carrier means supporting the drive rollers; andsupporting means supporting the carrier means with the drive rollers forangular movement about a carrier axis parallel to the core axis, andalso for movement with the supporting means toward and away from thecore axis.

0 support for supporting one pair of ends of the arms for Due to thefact that the drive rollers are supported on a pivotally mounted carriermeans, the two drive rollers can angularly move to hold the driverollers at all times in engagement with the wound up web whose diametervaries.

The pressure and frictional engagement between the drive rollers and thewound up web depends on the action of the adjustable motors on the arms,and the motors are adjusted by control means depending on the angularposition of the pair of arms, which is preferably signalled by apotentiometer. I

A regulating unit is provided, controlling a pressure valve whichcontrols one or more hydraulic systems or similarregulating systemscontrolling the adjustable hydraulic motors which operate the swing armsto press the drive rollers against the wound up web. In this manner, thecontact pressure between the drive rollers and the web roll can becontrolled in a predetermined manner, for example by decreasing,maintaining constant, or increasing the pressure between the driverollers and the web. The contact pressure exerted by drive rollers onthe web roll can therefore be varied in a predetermined manner dependingon the radius of the wound up web roll as required for the specific webroll which is being wound up. It is advantageous to provide operatingmeans also for pivoting the carriers relative to the swing arms.Hydraulic motors are used which are connected with the carrier means toangularly displace the same relative to the swing arms. The carriermeans are preferably a pair of bearing flanges supporting the driverollers, and being pivotally mounted on the swing arms.

The contact pressure exerted by the drive rollers on the wound up web,can be additionally varied by means of this hydraulic system.

It is advantageous to provide a'discharge lamp onto which a completedweb roll drops when the winding core thereof is released by thebearings. The finished web roll can easily roll down the ramp to asupport on which it rests.

In order to perform the above-described discharge operation, the carrieraxis of the bearing flanges in the pair of swing arms, is spaced agreater distance from the support than the axis of the winding core.When the winding core is then released from its bearing, the greaterpart of the weight of the web roll acts on the drive roller closer tothe support than on the other drive roller, and this causes an angularmovement of the carrier means or bearing flanges about the carrier axison the swing arms so that the other drive roller farther spaced from thesupport, urges the web roll to move over the first roller onto thedischarge ramp.

The novel features which are considered as characteristic for theinvention are set forth in particular in the appended claims.'Theinvention itself, however, both as to its construction and its method ofoperation, together with additional objects and advantages thereof, willbe best understood from the following description of specificembodiments when read in connection with the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWING FIG. I is a side view illustrating anembodiment of the invention;

FIG. la is a fragmentary side view illustrating a detail of theembodiment of FIG. 1',

FIG. 2 is a plan view taken in the direction of the arrow II in FIG. 1;

FIG. 2a is a schematic diagram illustrating a partly electric, andpartly hydraulic control circuit for controlling hydraulic operatingmeans of the embodiment of FIG. 1;

FIG. 2b is partly a fragmentary plan view, and partly a diagramillustrating a hydraulic circuit for angularly displacing the carriersof the drive rollers of the embodiment of FIG. 1',

FIG. 3 is a front view taken in the direction of the arrow III in FIG.1;

FIG. 3a is partly a fragmentary front view, and partly a diagramillustrating a hydraulic circuit for releasing a winding core from itsbearings;

FIG. 4 is a fragmentary, partially sectional view, illustrating theregion illustrated by the arrow IV in FIG. 2 on an enlarged scale;

FIG. 4a partly corresponds to FIG. 4, and partly shows a diagramillustrating the hydraulic circuits of the hydraulic motors by which thedrive rollers are rotated; and

FIG. 5 is a fragmentary front view illustrating the control panel of theapparatus.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawing,two drive rollers 1 and 2, which may be rubber coated, are supported bylateral carriers, shown to be bearing flanges, 3 and 4 having bearingbores in which the shaft end portions 2 of drive rollers l and 2 aremounted for rotation, as best seen in FIG. 4. The carriers or bearingflanges 3 and 4 are connected with each other and maintained at therequired axial distance by a cross beam 5. Each end of the cross beam issecured to the corresponding bearing flange, for example by screws.Cross beam 5 has shaft end portions L which support the carriers orbearing flanges 3 and 4, for angular movement at the ends of a pair ofswing arms 6 and 7 which have ends connected by a shaft 13 mounted inbearings 13a of support means 20. A pair of hydraulic cylinder andpiston motors 8 and 9 connects the swing arms 6 and 7, respectively,with arms 10a which are secured to the cross beam 5, so that byoperation of the hydraulic motors 8 and 9, the bearing flanges 3 and 4are turned about the axis 10 of the shaft portions L, resulting inangular displacement of drive rollers I and 2 relative to the swing arms6 and 7. When the piston rods of the hydraulic motors 8 and 9 move inthe direction of the double arrow PfI, the carrier means 3, 4, 5 turnsin the direction of the double arrow PfZ. FIG. 2b shows the hydrauliccircuit by which the hydraulic piston and cylinder motors 8 and 9 areoperated. The two working chambers on opposite sides of the pistons 8a,9a are connected by conduits with control valves 60 and 61, each ofwhich is shifted by an electromagnet between the two schematicallyindicated positions for effecting reversal of the piston movement ofhydraulic motors 8 and 9. A pump P supplies pressure fluid through apressure responsive limit valve 62 to the control valves 60 and 61. Amanometer 63 indicates the pressure in the hydraulic circuit. When thepressure in the system is too high, fluid is discharged from the lowpressure dis' charge conduit 63 by the action of the pressure limitingvalve 62, which is adjustable.

As best seen in FIGS. 2, 4 and 4a, the shaft portions Z of the driverollers 1 and 2 penetrate the respective bearing flanges 3 and 4, andare connected to the rotors of two independently operable hydraulicmotors I1 and 12. The rotary hydraulic motors 11 and 12 drive the driverollers I and 2 with the required torque, and are adjustable for varyingthe torque and rotary speed of the rotors.

FIG. 4a shows two hydraulic control circuits 52 and 53 for adjusting thehydraulic motors 11 and 12, respectively. Each control circuit includesa motor M driving a pump P which pumps fluid into the respectivehydraulic motor 11 or 12. A pressure limiting valve 55 limits the outputpressure of pump P and discharges through conduit RL into an opendischarge container 54 when the pressure is too high. Another pressurelimiting valve 50 discharges when the suction pressure of the pumpbecomes too high.

The swing arms 6 and 7, which are rigidly connected by the cross shaft13 at the ends thereof remote from the bearing flanges 3 and 4, areconnected by a gear sector 14 and a pinion 15 with a potentiometer 16 asshown in FIGS. 1 and 2.

A pair of hydraulic cylinder and piston motors 17 and I8 is provided forturning the swing arms 6 and 7 in clockwise direction about the axisdetermined by bearings 13a, so that the bearing flanges 3 and 4 with thedrive rollers I and 2 are pressed against the web being wound on thecore WK. This pressure is controlled by adjustment of the hydrauliccylinder and piston motors 17 and 18.

FIG. 2a shows the circuit of the potentiometer 16 which transmitsresistance signals through conductors E depending on the angularposition of the arms 6 and 7, and of the tap of the potentiometer 16which is connected for rotation with the cross shaft 13 and the arms 6and '7. The signals of the potentiometer, representing differentresistances and angular positions, are transmitted to the regulatingdevice 54 which generates and transmits corresponding control pulses toa hydraulic control valve 55 of a hydraulic control circuit whichincludes a pump P driven by motor M, an open discharge container 81, athrottle and check valve 82, a pressure responsive valve 83, and anelectromagnetically operated control valve 84 capable of reversing theflow in the hydraulic cylinder and piston motors 17 and 18. Thehydraulic circuit further includes a number of check valves 85, and apressure limiting valve 86.

The partly electric, and partly hydraulic control circuit shown in FIG.2a operates the hydraulic motors l7 and 18 in such a manner that thepressure of the drive rollers 1 and 2 against the web being wound up,depends on the diameter of the web and correspondingly on the radialdistance between the drive rollers and the core axis.

The adjustment of the pressure is particularly carried out while theradius of the web roll increases. For example, as the radius R of theweb roll increases, the pressure of drive rollers 1 and 2 can beincreased or decreased, or maintained at the same level, depending onthe desired density of the completed roll, or on a desired variation ofthe density within the roll. Depending on the desired pressure, oil issupplied to the hydraulic motors l7 and 18 by the electro-hydrauliccircuit shown in FIG. 2a. As best seen in FIGS. 1 and 2, one pair ofends of the hydraulic motors 17 and 18 is pivotally secured to the swingarms 6 and 7, and the other ends are pivotally secured to a rigidsupport.

On the right side of FIG. 2, a rigid support is shown, which has aslightly slanted support face 20a, and a stop face 20b for receiving andholding a completed web roll W. A discharge ramp 19 is provided and hasa top surface downwardly slanted toward the support face 20a, and havinga higher end on the left as viewed in FIG. 1 located under the wound upweb roll W.

As shown in FIG. 3, bearings 21 and 22 are provided on supports St andslidingly receive shafts or journals 30, 31 having non-circular couplingportions 35 which cooperate with corresponding recesses 36 in thewinding core WK, as best seen in FIG. 3. During the winding of a web onthe winding core WK, the coupling portions 35 are in the recesses 36,and the drive rollers 1 and 2, pressing against the wound up web, causerotation of the web roll W together with the winding core WK whilejournals and 31 rotate in bearings 21, 22.

As shown in FIG. 3a, the journals 30 and 31 carry pistons 56 and 57located in the bearing cylinders 21, 22, respectively, which areconstructed as closed hydraulic cylinders so that by supplying anddischarging fluid from the working chambers formed by pistons 56 and 57in the cylinders 21 and 22, the journals 30 and 31 are moved between aposition releasing the winding core WK and a position coupled with thewinding core. The movement of the piston journals 311, 31 is controlledby two hydraulic circuits 80 and 80 each of which includes check valves81, throttles 82, a control valve 83 operated by electromagnetic meansbetween two control positions for reversing the flow to and from thebearing cylinders 21, 22, and a pressure limiting valve 84.

The mode of operation of the apparatus, and further characteristics ofthe invention will now be described, starting at the moment at which thecompleted web roll W is to be changed. When the web roll has been woundto the required diameter, the hydraulic circuits 80 and 80' operate thepistons 56 and 57 in cylinders 21 and 22 so that the coupling portions85 are withdrawn from the recesses 86 of the winding core WK, as shownin FIGS. 3 and 3a. Limit switches 23 and 24 are operated by the movingjournals 30 and 31 to generate signals indicating the coupled orreleased condition of the winding core WK.

When the winding core WK has been released, the weight of the wound upweb roll urges the drive roller 1 downward, as shown in FIG. 1 since thecenter of the core is located above drive roller 1. The displacement ofdrive roller 1 causes pivotal movement of the bearing flanges orcarriers 3 and 4 so that drive roll 2 moves with the carriers 3 and 4upward and against the web roll W, as indicated by an arrow in FIG. 1. Astop is provided for limiting the angular movement of the carriers 3, 4about the axis 10, and may be a stop portion 32 of carrier 3 abutting aportion of arm 6 in a stop position.

Since the carrier axis 10 of the carriers 3 and 4 is farther spaced fromthe support 20 and the ramp 19 a greater distance than the axis of coreWK, the web roll W is automatically pushed onto the higher end of theslanted ramp 19, so that the web roll rolls along the ramp 19 onto thesupporting face 20a, stopped by the stop face 20b. The web end portion33 is cut off by a cutter, not shown, and the finished web roll W can beremoved from support 20.

' For the next winding operation, a new winding core WK must be used.When a new core WK is placed in the position shown in FIGS. 3 and 3a,the valves 83 are operated to shift the piston journals 30 and 31 inwardso that the ends of the winding core are coupled by coupling portions 85so that the new core is supported for rotation by the journals 311, 31in bearings 21, 22, as best seen in FIG. 3a.

The operation of valves 83, 83' can be carried out semi-automatically byoperation of a manual switch 70, shown in FIG. 5 which illustrates acontrol panel for the apparatus of the invention. When switch isoperated, the required operations for securing the new winding core Ware automatically carried out by the electromagnets 89, 89' of controlvalves 83, 83'.

The control means shown in FIG. 2a control the operating means 17 and 18to move the swing arms 6 and 7 to a position 7', shown in FIG. 1 andFIG. 1a, so that the drive rollers 1 and 2 engage the winding core WK inthe positions 1' and 2. In this position, the swing arm 7 operates alimit switch 59 which causes the control circuit of the operating motors17 and 18 to lock the operating means 17 and 18 in the position 7. Thecontrol means of the apparatus also control the hydraulic cylinder andpiston motors 8 and 9, as shown in FIG. 2b so that the drive rollers 1and 2 are displaced together with the carriers 3 and 4 to the positions1 and 2' shown in FIGS. 1 and 1a. The parts 6, 7, 3, 4, 1 and 2, and thebearings 21, 22 with the journals 31, 30 are all placed in a position inwhich the next web roll can be wound.

The further steps of the operation are either controlled by manualoperation of a key, or take place fully automatically, effecting themovement of the journals 30, 31 to the coupled position, not shown, inwhich the journals 31), 31 move in the directions of the arrow Pf4, PfSshown in FIG. 3 into engagement with the winding core. When the windingcore is supported in this manner in bearings 21 and 22, the limitswitches 23 are actuated so that the journals 30, 31 are blocked againstaxial movement, assuring a reliable bearing support for the winding corewhich now starts its rotation in the direction of the arrow Pfo shown inFIG. 1.

The winding operation may be started by operation of a manual switchwhich causes the actuation of the hydraulic cylinder and piston motors17 and 18 in such a manner that the desired pressure of the driverollers 1 and 2 against the web depends on the diameter of the web rollwhose diameter continuously increases. The hydraulic piston and cylindermotors 8 and 9 can be automatically operated to vary the pressurebetween the drive rollers 1 and 2 and the web. Furthermore, the driverollers 1 and 2 are driven by the rotary hydraulic motors 11 and 12,which turn drive rollers l and 2 in accordance with the arrows Pf7 sothat the web roll W rotates in the direction of the arrow Pf6 shown inPK]. 1. Since both drive rollers l and 2 are mounted on carriers 3 and 4for angular movement together about the axis 10, the drive roller caneasily adjust to the circumferential contour and curvature of thewinding core or web roll.

The torque exerted during this operation by the web roll and windingcore on the drive rollers 1 and 2, and on the carriers 3 and 4,respectively, in relation to the carrier axis 10, can be compensated asrequired, and if necessary overcompensated by the hydraulic cylinder andpiston motors 8 and 9. The possibility of varying in the course of thewinding operation the contact pressure between the drive rollers l, 2and the web roll W, has already been mentioned.

When a winding operation on a core has been finished, and the core WKhas been released as shown in FIGS. 3 and 3a, the hydraulic cylinder andpiston motors 8 and 9 can assist in the discharge of the finished webroll by swivelling the carriers or bearing flanges 3 and 4 about theiraxis to cause drive roller 1 to move down, and drive roller 2 to moveupward it is advantageous to place the carriers 3 and 4 with the driverollers 1 and 2 in a position located below the web roll W.

FIG. 5 shows schematically the control panel of the apparatus .of theinvention. The manually operated switch by which the operations forinserting a new winding core W is started, is designated by referencenumeral 70. By operation of the switch 7ll, the journals 30 and 31 aremoved to the releasing position so that the web roll W rolls to theposition W'. The switch 72 manually control the hydraulic motors i7, 18,if it is desired to move the arms 6 and 7 upward. Potentiometers 63 and64 are provided for controlling the contact pressure depending on thevarying radius of the web roll in a program determined manner, asexplained above. An indicator device 65 shows the pressure in thecylinder and piston motors l7 and 18. 66 is an emergency switch in whichthe operation can be interrupted in an emergency.

Instead of using hydraulic motors 8, 9 and l7, l8, operated with oil aspressure medium, pneumatic cylinder and piston motors can also be used.If necessary, the

required regulating forces can be mechanically produced. However, thecontrol and regulation by hydraulic cylinder and piston motors isparticularly advantageous especially with a view to efficient controland establishment of definite control positions.

The apparatus is particularly suited for the winding of web rollsconsisting of cord fabric with loose weft inserts, as are required forthe manufacture of car tires, where the hardness of the web roll has toconform to the weight of the material and its properties, and in whichcertain winding densities are required.

It will be understood that each of the elements described above, or twoor more together, may also find a useful application in other types ofwinding apparatus for a web differing from the types described above.

While the invention has been illustrated and described as embodied in awinding apparatus with two drive rollers engaging the wound up web andbeing pivotally mounted on movable supporting arms. it is not intendedto be limited to the details shown, since various modifications andstructural changes may be made without departing in any way from thespirit of the present invention.

Without further analysis, the foregoing will so fully reveal the gist ofthe present invention that others can by applying current knowledgereadily adapt it for various applications without omitting featuresthat, from the standpoint of prior art. fairly constitute essentialcharacteristics of the generic or specific aspects of this inventionand, therefore, such adaptations should and are intended to becomprehended within the meaning and range of equivalence of thefollowing claims.

What is claimed as new and desired to be protected by Letters Patent isset forth in the appended claims.

We claim:

1. Winding apparatus for a web comprising a core; bearing meanssupporting said core for rotation about a core axis; a pair of driverollers for frictionally engaging and winding up a web on said core;carrier means supporting said drive rollers; supporting means supportingsaid carrier means with said drive rollers for angular movement about acarrier axis parallel to said core axis, and also for movement with saidsupporting means toward and away from said core axis; operating meansfor displacing said supporting means with said carrier means and driverollers so that said drive rollers are pressed against the web forwinding up the web while said carrier means assumes a position in whichboth said drive rollers abut the web being wound up, irrespective of thediameter of the wound up web roll.

2. Winding apparatus as claimed in claim 1 wherein said operating meansinclude adjustable motor means for displacing said supporting means forvarying the pressure between said drive rollers and the wound up web.

3. Winding apparatus as claimed in claim 1 wherein said supporting meansinclude a pair of arms, and a support for supporting one pair of ends ofsaid arms for angular movement; wherein said carrier means includebearing flanges supporting the ends of said drive rollers for rotation,and being mounted on said arms, respectively, for angular movement aboutsaid carrier axis; and wherein said operating means connect said supportwith said arms.

4). Winding apparatus as claimed in claim 3 wherein said operating meansinclude a pair of adjustable motors connecting said support with saidarms, respectively; and control means for adjusting said motorsdepending on the angular position of said pair of arms.

5. Winding apparatus as claimed in claim 4 wherein said motors arehydraulic motors; and wherein said control means include an electricdevice connected with said arms for angular movement between angularpositions for generating different signals, control valve meanscontrolled by said signals, and a hydraulic control circuit connectingsaid control valve means with said adjustable motors for adjusting thesame in accordance with the angular positions of said arms.

6. Winding apparatus as claimed in claim 1 and including other operatingmeans connected with said carrier means for angularly displacing saidcarrier means relative to said supporting means so that said pair ofdrive rollers can be placed in different positions.

7. Winding apparatus as claimed in claim 1 compris ing a pair of drivemotors mounted on said carrier means for driving said drive rollers,respectively, independently of each other.

8. Winding apparatus as claimed in claim 7 wherein said drive motors arehydraulic motors connected with said drive rollers, respectively; andfurther comprising a pair of hydraulic circuits including a pair ofpumps, and a pair of control valve means connecting said pumps with saidhydraulic motors, respectively, and being independently operable toadjust the torque and rotary speed of said hydraulic motors.

9. Winding apparatus as claimed in claim 1 comprising a support for acompleted web roll; and a ramp downward slanting toward said support,and having one end located under said core and a web roll wound thereon;and means for releasing said core from said bearing means so that thecompleted web roll drops onto said one end and rolls down said rarnponto said support.

10. Winding apparatus as claimed in claim 9 wherein said carrier axis isspaced farther from said support than said core axis so that the weightof the completed web roll urges said carrier means to turn so that saiddrive rollers move the web roll onto said one end of said ramp.

ll. Winding apparatus as claimed in claim 10 wherein said pair of driverollers is located below said core and a web roll wound thereon.

12. Winding apparatus as claimed in claim 11 wherein said one end ofsaid ramp is located adjacent one of said drive rollers; and wherein theuppermost portion of said one drive roller is located slightly abovesaid one end of said ramp when engaging a completed web roll;

13. Winding apparatus as claimed in claim 12 wherein said carrier meansinclude a stop portion engaging said supporting means in an angularposition of said carrier means for stopping said carrier means in a stopposition in which said one drive roller is lower than the respectiveother drive roller so that a completed web is pushed onto said one endof said ramp; and comprising other operating means connected with saidcarrier means for angularly displacing said carrier means relative tosaid supporting means to said stop position.

14. Winding apparatus as claimed in claim 11 wherein said bearing meansinclude two journals for engaging the ends of said core; comprising twohydraulic motors operable for withdrawing said journals from said coreso that a core with a completed web roll can be released to rest on saiddrive rollers.

15. Winding apparatus as claimed in claim 14 comprising limit switchesoperated by said two journals for causing locking said journals inengagement with said core when said supporting means are in a positionin which said drive rollers are operative.

16. Winding apparatus as claimed in claim 1 including program controlledmeans for actuating said operating means to move said supporting meansso as to vary the pressure between-said drive rollers and said wound upweb in a predetermined cycle.

1. Winding apparatus for a web comprising a core; bearing meanssupporting said core for rotation about a core axis; a pair of driverollers for frictionally engaging and winding up a web on said core;carrier means supporting said drive rollers; supporting means supportingsaid carrier means with said drive rollers for angular movement about acarrier axis parallel to said core axis, and also for movement with saidsupporting means toward and away from said core axis; operating meansfor displacing said supporting means with said carrier means and driverollers so that said drive rollers are pressed against the web forwinding up the web while said carrier means assumes a position in whichboth said drive rollers abut the web being wound up, irrespective of thediameter of the wound up web roll.
 2. Winding apparatus as claimed inclaim 1 wherein said operating means include adjustable motor means fordisplacing said supporting means for varying the pressure between saiddrive rollers and the wound up web.
 3. Winding apparatus as claimed inclaim 1 wherein said supporting means include a pair of arms, and asupport for supporting one pair of ends of said arms for angularmovement; wherein said carrier means include bearing flanges supportingthe ends of said drive rollers for rotation, and being mounted on saidarms, respectively, for angular movement about said carrier axis; andwherein said operating means connect said support with said arms. 4.Winding apparatus as claimed in claim 3 wherein said operating meansinclude a pair of adjustable motors connecting said support with saidarms, respectively; and control means for adjusting said motorsdepending on the angular position of said pair of arms.
 5. Windingapparatus as claimed in claim 4 wherein said motors are hydraulicmotors; and wherein said control means include an electric deviceconnected with said arms for angular movement between angular positionsfor generating different signals, control valve means controlled by saidsignals, and a hydraulic control Circuit connecting said control valvemeans with said adjustable motors for adjusting the same in accordancewith the angular positions of said arms.
 6. Winding apparatus as claimedin claim 1 and including other operating means connected with saidcarrier means for angularly displacing said carrier means relative tosaid supporting means so that said pair of drive rollers can be placedin different positions.
 7. Winding apparatus as claimed in claim 1comprising a pair of drive motors mounted on said carrier means fordriving said drive rollers, respectively, independently of each other.8. Winding apparatus as claimed in claim 7 wherein said drive motors arehydraulic motors connected with said drive rollers, respectively; andfurther comprising a pair of hydraulic circuits including a pair ofpumps, and a pair of control valve means connecting said pumps with saidhydraulic motors, respectively, and being independently operable toadjust the torque and rotary speed of said hydraulic motors.
 9. Windingapparatus as claimed in claim 1 comprising a support for a completed webroll; and a ramp downward slanting toward said support, and having oneend located under said core and a web roll wound thereon; and means forreleasing said core from said bearing means so that the completed webroll drops onto said one end and rolls down said ramp onto said support.10. Winding apparatus as claimed in claim 9 wherein said carrier axis isspaced farther from said support than said core axis so that the weightof the completed web roll urges said carrier means to turn so that saiddrive rollers move the web roll onto said one end of said ramp. 11.Winding apparatus as claimed in claim 10 wherein said pair of driverollers is located below said core and a web roll wound thereon. 12.Winding apparatus as claimed in claim 11 wherein said one end of saidramp is located adjacent one of said drive rollers; and wherein theuppermost portion of said one drive roller is located slightly abovesaid one end of said ramp when engaging a completed web roll. 13.Winding apparatus as claimed in claim 12 wherein said carrier meansinclude a stop portion engaging said supporting means in an angularposition of said carrier means for stopping said carrier means in a stopposition in which said one drive roller is lower than the respectiveother drive roller so that a completed web is pushed onto said one endof said ramp; and comprising other operating means connected with saidcarrier means for angularly displacing said carrier means relative tosaid supporting means to said stop position.
 14. Winding apparatus asclaimed in claim 11 wherein said bearing means include two journals forengaging the ends of said core; comprising two hydraulic motors operablefor withdrawing said journals from said core so that a core with acompleted web roll can be released to rest on said drive rollers. 15.Winding apparatus as claimed in claim 14 comprising limit switchesoperated by said two journals for causing locking said journals inengagement with said core when said supporting means are in a positionin which said drive rollers are operative.
 16. Winding apparatus asclaimed in claim 1 including program controlled means for actuating saidoperating means to move said supporting means so as to vary the pressurebetween said drive rollers and said wound up web in a predeterminedcycle.